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def invasion_fitness(z, zm, pars):
n_res = z / pars
return zm - pars * n_res
def invasion_fitness2(z, zm, pars):
alpha, beta = pars
n_res = (z - z**beta) / alpha
return zm - zm**beta - alpha * n_res
def pop_dynamics2(t, n, pars):
alpha, beta, z = pars
return n * (z - z**beta - alpha * n) |